Bedienungsanleitung Buderus Logano plus GB402 (Seite 46 von 60) (Englisch)

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10 Troubleshooting

Logano plus GB402 – 6 720 804 428 (2012/09)

V 4U 521 Excessive sensor

differential at the

boiler sensor

between

temperature

sensors 1 and 2.

Excessive temperature

differential between

temperature sensors

1 and 2 (deviation

> 5 K/2s).

Check that the "Reset" button

illuminates on the SAFe.

Press "Reset" on the SAFe.

Check that the check valve on the

cylinder primary pump is closed.

Close the check valve if it is still

open.

Check whether the flow and

return have been connected

correctly.

If flow and return have been

swapped, connect flow and

return correctly.

Check whether the plug-in

connection on the boiler sensor

and on the SAFe are

contaminated or damaged.

If required, clean or replace the

plug-in connections.

Check the resistances at the

boiler sensor according to table or

visually inspect the plug at the

temperature sensor.

Replace the boiler sensor if the

sensor values deviate from the

stated values, or if the plug is

faulty.

Check the voltage values on the

boiler sensor according to table.

Replace the SAFe if there are

deviations.

V 4U 522 Boiler sensor

short circuit

between

temperature

sensors 1 and 2.

A temperature sensor

fault was detected in

test mode.

Check the sensor lead.

Check the plug-in connection.

Replace in case of damage.

Clean or replace if

contaminated.

Refit plug it is found to be

loose.

Check sensor values according to

table.

Replace the temperature

sensor in case of deviations.

Check the voltage at the

temperature sensor according to

table.

Replace the SAFe in case of

deviations.

V 4Y 523 Boiler

temperature

sensor lead

break.

Temperature too low at

the boiler temperature

sensor (< -5 °C)

Check the sensor lead. Replace in case of damage.

Check the plug-in connection. Clean or replace if

contaminated.

Replace in case of damage.

Refit plug it is found to be

loose.

Check sensor values according to

table.

Replace the temperature

sensor in case of deviations.

Check the voltage at the

temperature sensor according to

table (SAFe documentation).

Replace the SAFe in case of

deviations.

V 4U 524 Boiler sensor

short circuit.

The boiler sensor

detected an

excessively high

temperature

(> 130 °C).

Check the sensor lead. Replace in case of damage.

Check the plug-in connection. Clean or replace if

contaminated.

Replace in case of damage.

Refit plug it is found to be

loose.

Check sensor values according to

table.

Replace the temperature

sensor in case of deviations.

Check the voltage at the

temperature sensor according to

table (SAFe documentation).

Replace the SAFe in case of

deviations.

V 4A 575 Intelligent high

limit safety cut-

out responds.

The boiler flow

temperature has

reached its maximum

permissible level.

Hi limit safety cut-out has

responded.

Check gas train.

(Does the flame extinguish

after a control shutdown?)

B 5L 542 Incomplete

communication

with the SAFe.

The MC10 generates

this fault if not all

required data is

supplied by the SAFe.

Check the cabling between the

SAFe and the MC10.

Replace the SAFe if the

connections are OK.

Type

Display

code

Fault code Cause Description Test procedure/cause Correction

Tab. 22 Fault displays

1) V = locking; B = blocking

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